Their visit also included an a cappella version of the alphabet song. We’re not sure why Harry and Liam are on the floor and why the former has a big fat grin on his face. Bert is clearly the star of the performance, especially with the little mix-up near the end.

Meanwhile, the dudes are currently on the European leg of their Where We Are tour, with doubleheaders in Amsterdam and Milan to round out the month.

The One Direction Sesame Street episode is slated to air this fall. Check your local PBS listings. And make sure you know your ABCs.